man that was my dream a few years back when i had mk3, i wanted it all the 4x4 v6 biturbo, then realised it'd be cheaper to buy and insure an actual vehicle to that spec :/
good luck i'd luv to see that thing on a track and 1/4 mile
not to put down the idea but what i considered, is its longitudinal in the rs4 and pretty long bulky thing, but the bulkhead in the audi is much further forward.
heck if the golf needs major surgery it'd still be great to see it with a 30 valve biturbo lump in there!